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Photonics based Tunable Multiband Microwave Filter for Wireless Communications Devices

Details

Project TitlePhotonics based Tunable Multiband Microwave Filter for Wireless Communications Devices
Track Code2332
Short Description

The invention is a frequency-band-selectable multiband pass filter (or multiband filter) based on the use of a tunable two-stage optical Lyot filter. Radio frequency (RF) bandpass filters are designed to select signals with a desired frequency and then block the unwanted or interfering frequency bands. This feature is widely used in various applications such as radar systems, wireless communications, and satellite communications. A RF bandpass filter with multiple passbands (Multiband Microwave Filter) and flexible configuration capability is highly desired due to the multiplexing of multiband signals that are commonly found in multiband wireless communication systems. Unfortunately, such RF bandpass filters are difficult to achieve using conventional RF electronics techniques because of the lack of tunability in RF electronics, making it difficult to simultaneously satisfy all the tight design parameters for every passbands. The tunable multiband microwave filter is an essential component in satellite communications, multiband wireless communications, military and other secure communications. It can be used with multiband antenna for pre-selection of channel, as well as preventing interference in multiband communications. With the 12 dynamic high-quality passbands currently in use, the multiband system can support a large number of functions, and provide a more secure system for communications. With miniaturization and hybrid integration technologies, the tunable multiband filter can be made small and portable.

Abstract

 

Drawing inspiration from high-speed photonics, the UGA Inventors have invented a frequency band selectable multi-bandpass filter (or multiband filter) based on the use of a tunable two-stage optical Lyot filter. This multiband filter features three operating states, i.e. single-pass state, multi-pass state, and all-block state. This new configuration allows, in multi-pass state, up to 12 passbands within the frequency band of interest at the same time. Both the passbands number and frequencies are flexibly tuned. Sidelobe suppression of the passbands in single-pass state is up to 40 dB, and all the passbands shows a >30 dB side lobe suppression in multi-pass state. All the passbands have uniform and clean filter profile as well as similar passband bandwidth of 200 MHz. Passband bandwidth may be further narrowed. There is potential for a continuously tuning frequency via use of an electrical/optical phase shifter (on-going work).

 

 

               

References and Intellectual Property:

 
Tagstelecommunications, Tunable RF Filter, bandpass, RF, filter, wireless, communication, security, multiband, radio
 
Posted DateNov 14, 2017 3:21 PM

People

Name
Cheryl Junker